Bevel attachment for folding rules



(ModeL) w G. D. OOWGILL. BEVEL ATTACHMENT FOR FOLDING RULES;

No. 451,810. Patented May 5,1891.

WITNESSES.

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.21 tiornay NITED STATES PATENT OFFICE.

CHRISTIAN D. OOW'GILL, OF TERRE I-IAUTE, INDIANA.

BEVEL ATTACHMENT FOR FOLDING RULES.

SPECIFICATION forming part of Letters Patent No. 451,810, dated May 5, 1891.

Application filed F ruary 25, 1890. $erial No. 341,652. (ModeL) 1 0 aZZ whom it may concern:

Be it known that I, CHRISTIAN D. COWGILL, a citizen of the United States, and aresidentof Terre Haute, in the county of Vigo and State of Indiana, have invented certain new and useful Improvements in Rule Attachments; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to improvements in rule attachments designed more especially for the use of sheet-metal workers, artists, draftsmen, machinists, carpenters, and all classes of mechanics.

The object of my invention, principally, is to provide means for determining with accuracy the pitch orinclination of roofs, and also to provide suitable means whereby sheetmetal workers may be enabled in a simple manner to obtain any angle at seam and diameter.

\Vith these objects in view, the invention consists in the improved construction and combination of parts, as hereinafter more fully pointed out and described.

Referring to the drawings, Figure 1 is a plan view of a device constructed in accordance with my invention. Fig. 2 is a view of the same closed, looking from the opposite side.

In the accompanying drawings, the letter A indicates an ordinary carpenters rule of twenty-four inches.

The letter B indicates a depending graduated arm, said arm being riveted to the central hinge of the rule. One side of this depending arm is provided with a series of graduated marks, said marks beginning near the top with 0 and terminating near the lower end in 125. Upon the reverse side of the graduated arm are arranged the different pitches of the roofs, beginning near the upper end with one-eighth, and at suitable intervals, the following fractions appearing in the order named, viz: one-fourth, one-third, threeeighths, one-half, five-eighths, three-fourths, seven-eighths, and the terminal whole.

A sliding sleeve 0 embraces the centrallydepending arm, said sleeve being provided with lateral flanges c c, to which are pivoted the lower ends of arms D D,said arms having their upper ends pivoted at a a to the rule. Passing through the sleeve and bearing against the graduated arm is aset-screw E, by means of which said sleeve may be retained in its adjusted position upon the graduated arm.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

In a rule attachment, the combination, with a measuring device,of a centrally-depending arm riveted to the measuring device at its central hinge-joint, said depending arm being provided upon its upper side with a series of graduated marks indicating degrees from the zero-point to 125 and on its under side with a series of graduated fractional marks, and a sliding sleeve upon said arm, said sleeve provided with lateral flanges, a set-screw for retaining said sleeve in its adjusted position, and connecting-arms having their upper ends pivoted to the rule or measuring-instrument and their lower ends pivoted to the flanges of the sliding sleeve, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

CHRISTIAN D. co WGILL.

Witnesses:

WILSON H. SoALE, CLEM HARPER.

one (1) or a. 

